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首页> 外文期刊>Environmental Science & Technology >Feedbacks Between Hydrological Heterogeneity and Bioremediation Induced Biogeochemical Transformations
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Feedbacks Between Hydrological Heterogeneity and Bioremediation Induced Biogeochemical Transformations

机译：水文非均质性与生物修复引起的生物地球化学转化之间的反馈

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摘要

For guiding optimal design and interpretation of in situ treatments that strongly perturb subsurface systems, knowledge about the spatial and temporal patterns of mass transport and reaction intensities are important. Here, a procedure was developed and applied to time-lapse concentrations of a conservative tracer (bromide), an injected amendment (acetate) and reactive species (iron(ll), uranium(VI) and sulfate) associated with two field scale biostimulation experiments, which were conducted successively at the same field location over two years. The procedure is based on a temporal moment analysis approach that relies on a streamtube approximation. The study shows that biostimulated reactions can be considerably influenced by subsurface hydrological and geochemical heterogeneities: the delivery of bromide and acetate and the intensity of the sulfate reduction is interpreted to be predominantly driven by the hydrological heterogeneity, while the intensity of the iron reduction is interpreted to be primarily controlled by the geochemical heterogeneity. The intensity of the uranium(VI) reduction appears to be impacted by both the hydrological and geochemical heterogeneity. Finally, the study documents the existence of feedbacks between hydrological heterogeneity and remediation-induced biogeochemical transformations at the field scale, particularly the development of precipitates that may cause clogging and flow rerouting.
机译：为了指导强烈扰动地下系统的原位处理的最佳设计和解释，对质量传输和反应强度的时空格局的了解非常重要。在这里，开发了一种程序，并将其应用于与两个现场规模生物刺激实验相关的保守示踪剂（溴化物），注入的修正物（乙酸盐）和反应性物质（铁（II），铀（VI）和硫酸盐）的时移浓度。 ，这是连续两年在同一现场进行的。该过程基于依赖于流管近似的时间矩分析方法。研究表明，生物刺激反应会受到地下水文和地球化学异质性的显着影响：溴化物和乙酸盐的输送以及硫酸盐还原的强度被解释为主要受水文异质性的驱动，而铁还原的强度被解释为主要受地球化学异质性控制。铀（VI）还原的强度似乎受到水文和地球化学异质性的影响。最后，该研究记录了在田间规模上水文非均质性与修复引起的生物地球化学转变之间存在反馈的情况，特别是可能导致堵塞和流量改道的沉淀物的发展。

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  • 来源
    《Environmental Science & Technology》 |2009年第14期|5197-5204|共8页
  • 作者

    A. ENGLERT; S. S. HUBBARD; K. H. WILLIAMS; L. LI; C. I. STEEFEL;

  • 作者单位

    Earth Sciences Division, Lawrence Berkeley National Laboratory Applied Geology Department, Bochum University;

    Earth Sciences Division, Lawrence Berkeley National Laboratory;

    Earth Sciences Division, Lawrence Berkeley National Laboratory;

    Earth Sciences Division, Lawrence Berkeley National Laboratory;

    Earth Sciences Division, Lawrence Berkeley National Laboratory;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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